Claude Code v2.1.248 · 27 Aug 2026
Telemetry opt-out variables grouped in one set
Telemetry opt-out environment variables are now collected in one set alongside a forwarded allowlist.
Under the hood Tier: how much it should matter to you
2 Useful: my rating, 1 to 5
2 Signal: worth watching, 1 to 5
Telemetry Area: what it touches
Internal Changes Kind: in v2.1.248, 27 Aug 26
Internal Changes Section of the release
What
The environment variables that suppress non-essential traffic and telemetry are now collected into a single set, next to a larger allowlist of provider and proxy variables that is forwarded to subprocesses.
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Names in this entry
env CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC Set to any non-empty value, such as 1, to disable nonessential network traffic: auto-updates, telemetry, error reporting, the /feedback command, Claude-drafted feedback , release notes, the PR and MR status badge checks, and availability checks such as the fast mode check. It also stops the background runs of plugin command sources , which are local commands rather than network traffic, because they can trigger dependency installs. Setting it to 0 or false still disables this traffic , unlike most on/off variables; unset the variable to allow it again. Also disables feature-flag fetching, which makes Remote Control and the other features that need feature-flag fetching unavailable. Official plugin marketplace auto-install isn't covered; disable it with CLAUDE_CODE_DISABLE_OFFICIAL_MARKETPLACE_AUTOINSTALL. Doesn't affect gateway model discovery , which has its own opt-in
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Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.
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Telemetry events can now carry MCP server and tool names
Under the hood Telemetry
In v2.1.248 Internal Changes release-page order
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Legacy bundle capture records the git file kind
Under the hood Telemetry
